The Osborne Computer Corporation (OCC) was an American computer company and pioneering maker of portable computers. It was located in the Silicon Valley of the southern San Francisco Bay Area in California. Adam Osborne, the founder of the company, developed, with design work from Lee Felsenstein, the world's first mass-produced portable computer in 1981.

A portable computer is a computer designed to be easily moved from one place to another, as opposed to those designed to remain stationary at a single location such as desktops and workstations. These computers usually include a display and keyboard that are directly connected to the main case, all sharing a single power plug together, much like later desktop computers called all-in-ones (AIO) that integrate the system's internal components into the same case as the display. In modern usage, a portable computer usually refers to a very light and compact personal computer such as a laptop, subnotebook or handheld PC, while touchscreen-based handheld ("palmtop") devices such as tablet, phablet and smartphone are called mobile devices instead.